Unable to install XPS 8700 A14 BIOS update from USB

My XPS 8700 motherboard went dead. I just replaced it with a new one, but it came with A10 BIOS. I downloaded the XPS_8700_BIOS_A14.EXE and tried loading it from USB, booting with Windows 10 and Windows 11, as described in:
Dell XPS 8700 System BIOS | Driver Details | Dell US
But with both windows I get the msg that the file is not compatible with the windows version.
So, my question is how am I supposed to install it? Windows 7? I don't have any media for that and it is no longer available for download from Microsoft. Any help is appreciated.